Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 32)

BULLETIN 22

SMELLY WATER

CAUSES The most common cause of “smelly water” is a non-toxic sulfate reducing bacteria,

scientiﬁ cally termed Divibrio Sulfurcans. This bacteria often enters the water system

through construction or a break in ground piping. The bacteria creates the energy it

needs to survive by converting sulfate (SO4) to hydrogen sulﬁ de(H2S) gas you smell in

the water.

Hydrogen sulﬁ de gas is distinctive because of its rotten egg-like stench. Its presence

can severely affect the taste as well as the odor of the water. Occasionally this bacteria

can be accompanied by black deposits, the result of pipe and ﬁ tting corrosion. In

extremely high concentrations, hydrogen sulﬁ de gas can be toxic though the gas is

detectable long before harmful levels are reached.

The requirements for the bacteria to thrive are: a) an elevated level of sulfur in the

water, b) activated hydrogen from cathodic reactions within the tank, c) water with little

or no dissolved oxygen, d) and temperatures below 138°F.

Items that can increase the potential for this bacteria are: a) water softeners, b) well

water, c) and long periods of no water movement.

Other factors that may contribute to smelly water:

• Chlorides of Magnesium and Calcium leave a bitter taste.

• Chloride of Sodium produces a salty taste.

• Sulfates (50 ppm) gives a medicinal taste.

• Carbon Dioxide in a low pH water gives ﬁ zzy water.

• Iron and tannic waters also give a bad taste and odor.

TREATMENT The simplest treatment available is the shock-chlorination of the system. This

is a surface treatment, and often requires repeated trials in heavily infected

systems. The chlorination of a system requires that you follow each step

explicitly to avoid an un-treated portion of the piping system from reinfecting

another part. See Bulletin 23 for the chlorination procedure. Longer lasting

solutions include chlorination or aeration of the water supply.

NOTES Since rusty water is caused by a bacteria presence and is not caused by the

water heater, any treatment would not be considered warranty related.

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Reliant FVIR GAS WATER HEATER Technical Information Seite 32